/Engine/Plugins/Developer/Concert/ConcertApp/MultiUserClient/Source/MultiUserClientLibrary/Public/MultiUserClientStatics.h
Set whether presence is currently enabled and should be shown (unless hidden by other settings)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Multi-User Presence", Meta=(DevelopmentOnly, DisplayName="Set Multi-User Presence Enabled")) static void SetMultiUserPresenceEnabled ( const bool IsEnabled )